Figure 5

A plot of the zero-crossing signal with the second derivatives of the scale-space image of Figure 4. A plot of zero-crossing signal z[i,k], also called a finger print map on the top, along with the second derivatives on the bottom, representatively for k=40, 46, 52, and 59, of the scale-space image described in Figure 4, where the zero-crossing points from minus to plus (z[i,k] = +1) are denoted by ‘o’, and from plus to minus (z[i,k]= −1) by ‘+’.